And that's stupid... Trademarks... Fedora is opensource, yep?
So why is it restricted with trademarks?

Free and open source licenses cover copyrights and not trademarks.
Trademarks are required to protect a brand and the brand is valuable
enough to be protected. Otherwise anyone could do a distribution that
wipes off hard disks and call it Fedora. There are hundreds of
different FOSS projects where the brand is protected including the Linux
kernel, Apache, Mozilla Firefox and so on.